Topologically Enabled Ultralarge Purcell Enhancement Robust to Photon Scattering

TL;DR

This paper introduces a topological photonic structure with a plasmon nanoantenna that achieves high Purcell enhancement for single photon sources while being robust against scattering and absorption, advancing on-chip quantum light devices.

Contribution

It presents a novel topological photonic design that combines resonant plasmon nanoantennas with edge states to enable large Purcell enhancement resistant to scattering.

Findings

Single photon emission rate exceeds 10^4γ₀ into edge states.

Significant reduction in absorption compared to traditional plasmon structures.

Robustness of the structure against photon scattering.

Abstract

Micro/nanoscale single photon source is a building block of on-chip quantum information devices. Owing to possessing ultrasmall optical mode volume, plasmon structures can provide large Purcell enhancement, however scattering and absorption are two barriers to prevent them from being used in practice. To overcome these barriers, we propose the topological photonic structure containing resonant plasmon nanoantenna, where nanoantenna provides large Purcell enhancement while topological photonic crystal guides all scattering light into its edge state. Through the optical mode design, the rate of single photons emitted into the edge state reaches more than 104{\gamma}0 simultaneously accompanied with an obvious reduction of absorption. This kind of nonscattering large Purcell enhancement will provide new sight for on-chip quantum light sources such as a single photon source and nanolaser.